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 * Terrence reported the BS oplev was out of range, so we recovered the yaw alignment using the F0 yaw stepper motor. We had to move the length sensing QPD but we took note of the initial and final values in case we want to go back. Terrence measured IM TFs to make sure the payload didn't touch the security structure.
 * We assessed the height of the BS:
  * We set BF and F0 to zero
  * We chose the position of F1 so the optic was at the desired height.
  * The amount of actuation F1 required was about -24,000 counts, which is very large, and the keystone moved around -700 um, which is a very small amount given the tools we're using to measure height.
  * Given that the reproducibility of the measurement is within 700 um or so (e. g. PRM SF), for the sake of having a low actuation, we could choose a setpoint higher than the one we measured this week.
 * We calibrated the BS F1 LVDT using the optical displacement sensor.
  * We used a modified holder that allowed us to adjust an additional DoF.
  * We realized this device only works with specular reflection, so we had to tilt the sensor a lot (per the manual) and put think ballast mass with a more reflective surface.
  * We moved the F1 keystone with coil-magnet actuation only and the range was small. We should use the fishing rod also.
  * We got an straight line, which is very good news.
  * We should calibrate again with a larger displacement range.

Agenda/Minutes

Zoom Meeting


CRY+VIS Interface Meeting

Date: 2022/1/28 13:00-

Participants:

Post O3 Upgrade portal

Schedule

  • IX: Health check. Glitch in the F3 signals. Windshield for the MN oplev.
  • EX: Health check. Leake check on 1/25.
  • IY:
  • EY: Height adjustment on 1/25. Oplev setting on 1/26-27. Preparation for the accelerometers.

Status

  • Replacement of flip cables: Type-C.
  • TM height setting: ITMY.
  • Oplev: Setup of the TM Oplev in IY after the TM alignment in late Feb.
  • ACC: Preparation for EY.
  • Commissioning in air: Return of GRY. Alignment of ETMY.
  • Commissioning in vacuum:
  • Overall commissioning:
  • Acceptance check:
  • PF actuator: At the in-vacuum commissioning.
  • New vacuum pumps for V-chambers: EXV (transportation on 2/7, implementation on 2/8-11)
  • Heater control: Test in IXV/EXV is planed (Sequence). Power controller in IY.

  • Power source for Oplev: IY.
  • Tunnel for the IYC booth: Scheduled on 1/31.
  • TMS: Scheduled on 2/14-16.

Discussion


VIS Meeting

Date: 2022/1/28 14:00-

Participants:

Summary Report

Type-A

  • Adjusted the height of ETMY. The F1 damper was set in a gap of 2mm.
  • Repaired the actuator coil of ACC #3 in EY. Investigated the noise level of the accelerometers in IY.

Type-B

  • Terrence reported the BS oplev was out of range, so we recovered the yaw alignment using the F0 yaw stepper motor. We had to move the length sensing QPD but we took note of the initial and final values in case we want to go back. Terrence measured IM TFs to make sure the payload didn't touch the security structure.
  • We assessed the height of the BS:
    • We set BF and F0 to zero
    • We chose the position of F1 so the optic was at the desired height.
    • The amount of actuation F1 required was about -24,000 counts, which is very large, and the keystone moved around -700 um, which is a very small amount given the tools we're using to measure height.
    • Given that the reproducibility of the measurement is within 700 um or so (e. g. PRM SF), for the sake of having a low actuation, we could choose a setpoint higher than the one we measured this week.
  • We calibrated the BS F1 LVDT using the optical displacement sensor.
    • We used a modified holder that allowed us to adjust an additional DoF.
    • We realized this device only works with specular reflection, so we had to tilt the sensor a lot (per the manual) and put think ballast mass with a more reflective surface.
    • We moved the F1 keystone with coil-magnet actuation only and the range was small. We should use the fishing rod also.
    • We got an straight line, which is very good news.
    • We should calibrate again with a larger displacement range.

Type-Bp

Type-C

Electronics

Control

Schedule

See Schedule

  • Type-A team: Accelerometers in EY,
  • Type-B team:

Safety

Discussion

Travel Plans

(Date in Kamioka)

The week from 1/31

  • Takahashi: 2/1-4
  • Sato: 2/1-4
  • Hirata: 2/1-4

The week from 2/7

  • Takahashi: 2/8-10
  • Sato: 2/8-10
  • Hirata: 2/8-10

Next meeting

  • 2022/2/4(FRI)

KAGRA/Subgroups/VIS/VISMinutes20220128 (last edited 2022-01-29 08:31:51 by RyutaroTakahashi)